public class Example23 {
    public static void main(String[] args) {
        int arr[] = new int[4];
        arr[0] = 1;
        arr[1] = 2;
        System.out.println("arr[0] ="+arr[0]);
        System.out.println("arr[1] ="+arr[1]);
        System.out.println("arr[2] ="+arr[2]);
        System.out.println("数组长度是:"+arr.length);
    }
}
